[URL="http://api.tweetmeme.com/share?url=http://espn.go.com/nfl/story/_/id/7341718/sources-denver-broncos-closer-committing-tim-tebow-2012&service=bit.ly&source=espn"][IMG]http://api.tweetmeme.com/imagebutton.gif?url=http://espn.go.com/nfl/story/_/id/7341718/sources-denver-broncos-closer-committing-tim-tebow-2012[/IMG][/URL]If Tim Tebow continues to improve and leads the Broncos to the playoffs, the franchise is likely to commit to him as its starting quarterback in 2012 and not automatically use a first-round draft pick on another quarterback, according to team sources.